The evolution of the microstructure and properties of ageable Al-Si-Zn-Mg alloy during the recycling of milling chips through powder metallurgy
Although long/continuous metallic chips are easily recycled by melting, this is not the casefor discontinuous milling chips. The present study aimed to reduce waste generation andto facilitate the use of this byproduct in order to obtain a metallic-oxide composite. Chipswere collected after machinin...
- Autores:
-
Pulido-Suárez, P.A.
Uñate-González, K.S.
Tirado-González, J.G.
Esguerra-Arce, A.
Esguerra-Arce, J.
- Tipo de recurso:
- Article of investigation
- Fecha de publicación:
- 2020
- Institución:
- Escuela Colombiana de Ingeniería Julio Garavito
- Repositorio:
- Repositorio Institucional ECI
- Idioma:
- eng
- OAI Identifier:
- oai:repositorio.escuelaing.edu.co:001/1595
- Acceso en línea:
- https://repositorio.escuelaing.edu.co/handle/001/1595
https://www.sciencedirect.com/science/article/pii/S2238785420316525?via%3Dihub
- Palabra clave:
- Microestructura
Metalurgia de polvos
Metales pulverizados
Microstructure
Powder metallurgy
Composite
Discontinuous chips
Powder metallurgy
Aluminum alloys
Dynamic recrystallization
- Rights
- openAccess
- License
- https://creativecommons.org/licenses/by-nc-nd/4.0/
| Summary: | Although long/continuous metallic chips are easily recycled by melting, this is not the casefor discontinuous milling chips. The present study aimed to reduce waste generation andto facilitate the use of this byproduct in order to obtain a metallic-oxide composite. Chipswere collected after machining Al-Si-Zn-Mg alloy parts, and powders were obtained throughgrinding processes. Grinding was performed at 45, 69, and 94 h, with grinding bodies/chipsvolume ratios of 6:1, 8:1, 10:1 and 12:1. The resulting powders were characterized by scanningelectron microscopy, laser granulometry, and X-ray diffraction. After grinding, the parti-cles were compacted and sintered, and hardness was evaluated. It was found that metallicpowder is formed through plastic deformation, hardening, fracture, and dynamic recrystal-lization. It was possible to obtain samples with lower apparent density and higher hardnessby powder metallurgy from Al-Si-Zn-Mg alloy chips than from the bulk. Powder was obtainedafter grinding, and samples were obtained by compacting and sintering. The higher hard-ness value was attributed to the presence of Al2O3formed in the particles during grinding,which acts as a second reinforcing phase in the sintered samples, and as a retardant ofintermetallic phase growing |
|---|